Thermostat



J. J. LAWLER 1,783,574

THEBMOSTAT Filed Jan. 31, 1929 5 Sheets-Sheet l INVENTOR.

ma" JLau/Zen ATTORNE Dec. 2 1930. J. J. LAWLER 1,783,574

*mmmogru Filed Jan. 31, 1929 3 Sheets-Sheet 2 UUUUUUUU EJIIIJUIIIEIUU 1Q UEJUDEIEJIIID E EEEEEE EEJUEEE EJEJUEIEUEJ 52 33 any '7 Z Dec.2,.1930. J. J. LAWLER 1,733,574

THERMOSTAT v Filed Jan. 31. 1929 3 Sheets-Sheet INVEN TOR.

6 mm 6] Law/Z 21 Patented Dec. .2, 1930 UNITED STA PATENTIOFHCE;

' JAMES J. LAWLEB, OEMOUNT VERNON, NEW YORK 'rnnmrosran Applicationfiled iaimary 31, 1929. Serial No. 336,555.

This invention relates to certain new and useful improvements inthermostatic controllers for draft dampers and has for one of itsobjects to provide a thermostatic control for hot air registers and thelike operating to open the register when the temperature of a roomreaches a predetermined degree and 2 to be heated for outletting throughthe upper draft opening.

The thermostatic control is adapted for association with shutters ofregisters for hot air furnaces of the type embodying hot air fines andalso of the pipeless form whereby the temperature of a room may beeasily controlled. I

It is also intended that the thermostatic control may be. associatedwith steam and hot water heating systems in addition to the hot'airregisters, or wherever a damper, shutter, orvalve is to be controlled. ir

With the above andother objects in view that will become apparent as thenature of the invention is better understood, the same consists in thenovel form, combination and arrangement of parts hereinafter more fullydescribed, shown in the accompanying drawings and claimed. o I nthedrawings v v Figure 1 is a fragmentary front elevational view, partlyjinsection, showing the wall with a lower shutter controlled register andan upper grille covered draft opening, the heating elements in the wallcompartment and the thermostatic control for the register a shuttershownin section;

Figure 2 is a vertical cross-sectional view taken on line 22-of Figure 1shiiwing the heating element in the wall compartment interposed betweenthe lower cold air inlet and the upper hot air outlet and thethermostatic device controlling the shutters of the lower register;

Figure 3 is a diagrammatic front elevational view of'the illustration inFigure 1; v Figure 4 is a diagrammatic front elevational view, similarto Figure 3 showing the cold air inlet adjacent the floor line and thethermostatically controlled shutter or regis- 'ter at the upper end ofthe wall, the parts heing reversed as illustrated in Figure 3;

igurefi is a fragmentary elevational view showing the hot air pipe froma hot air furnace communicating with a Wall registeradjacent-the floorline that has its shutters thermostatically controlled;

Figure 6. is a fragmentary top plan view showing a thermostaticallycontrolled register in the floor for a pipeless furnace;

Figure 7 is a fragmentary enlarged plan view of a floor register shownin Figure 6 v with the thermostatic control device shown in section;

Figure 8 is a front elevational view of another form of thermostaticcontrol device showing a flap valve thermostatically operated forcontrolling a cold air inlet for a wall compartment containing a heatingelement; Figure 9 is a top plan view of the thermostatic device shown inFigure 8; I

Figure'lO is a vertical cross-sectional view taken on line 10-10ofFigure 8; and

Figure '11 is an enlarged horizontal sectional view taken on line 11-l1'of Figure 10.

The thermostaticdevice as illustrated in the different forms of theinvention comprises a cylindrical wall 1 constituting a casing withremovable top and bottom walls 2 and 3 respectively that are aperturedas at 4 to permit a free flow of surrounding air through the casing. Thethermostatic element of the device comprises an expansibletube orbellows 5 secured at their opposite ends by Spot-Welding or the like tometallic end plates 6 and 7, the expansihle tube 5 being completelyfilled in any suitable manner to the exclusion of all air with a.volatile fluid F. A support for the expansi ble tube 5 within the casing-1 has a screw 8 00 threaded through the central boss 9 in the upper endwall 2 with the lower end of the screw 8 having a swivel connection 10with the upper end plate 6. A coil spring 11 'is interposed between thelower end plate 7 and bottom wall 3 as illustrated, normally dium, thepipe 17 including a horizontal section 18 carrying heat radiating fins19. Cold air is admitted through the register 13 and in passing upwardlythrough the chamber 16 is heated by the radiating fins 19 and pipes 17and 18, and outlets through the opening 14 into the room. The register13 is shutter controlled and the thermostatic device is associated withthe shutters of the register. As illustrated, the arm 20 has its upperend connected to the lower end plate 7 of the expansible tube 5 anddepends from the casing 1 to a central opening in the bottom wall 3, thelower end of the arm 20 being connected as at 21 to the block 22vertically slidable in the slot 23 formed in the front wall of theregister 13, the block being connected as at 24 to the link 25 that hasa pin and arcuate slot connection 26 with the curved arms 27 carried bythe shutters 28 that are pivotally mounted as at 29 upon the oppositeside walls of the register 13.

The screw 8 may be adjusted to cause the shutters 28 to be opened andclosed at predetermined temperatures. Assuming that the shutters 28 arein their open position as illustrated in Figure 2, cold air from theroom will enter the register 13 and pass upwardly over the heatingelement of the chamber 16 and outwardly through the opening 14 forreturn in a heated condition into the room. When the air in the room hasreached apredetermined temperature, the bellows 5 or expansible tubewill expand against the tension of the spring 11 due to the heated airin the room circulating through the easing 1 in contact .with theexpansible tube, the arm 20 being lowered for operating the link 25 andshutters 28 connected thereto, thereby shutting oif the register 13 andpreventing the circulation of air through the heating chamber 16 in thewall 12. When the temperature in the room lowers, the cooler aircirculating through the casing 1 causes a contraction of the volatilefluid F within the bellows 5, the spring 11 moving the lower end plate 7of the bellows in an upward direction and shifting therewith the arm 20for again opening the shutters 28 so that air can again flow through theregister 13, upwardly through the heating chamber 13 and out to theopening 14 into the room. A full front elevational view of thisarrangement of the invention is diagrammatically illustrated in Fig. 3in which the thermostatically controlled shutter is-adja ,cent the floorline and the heated air outlet let 15a. In this form of the invention,cold n air is freely admitted to the heating chamber 16, but the outletthereof into the room through the register 13a is controlled by thethermostatic device located within the room. As shown in Figures 1 and2, the thermostatic casing 1 is carried by a bracket extension 30 fromthe bottom wall 3 that may be mounted upon the wall 12 or register 13.

In the form of the invention shown in Figure 5, the thermostatic deviceis associated with a wall register 31 constituting an outlet for heatedair passing through the pipe 32 from a hot air furnace the thermostaticdevice 1 having the arm 20a extending from the expansible tube to theshutter mechanism of the register 31.

The thermostatic device as shown in Figures 6 and 7 is associated with afloor register 33 of the type usually employed with a pipeless furnace,the arm 20?) from the thermostatic device 1 being pivotally con nectedat its outer end as at 34 with one arm 35 of a bell crank lever that ispivoted as at 36 to the reg ster 33. The other arm 37 of the bell cranklever has a pin and slot connection 38 with the shutter mechanism of theregister 33 that is operated upon expansion and contraction of thevolatile fluid F in the bellows 5.

In the form of the invention shown in Figures 8 to 11, the casing 1 ofthe thermostatic device being mounted upon the bracket 30a that has adepending frame wall 39 constituting a valve seat aligned with the airinlet opening 40 in the room wall 12, a flap valve or damper 41 ispivotally connected as at 42 to the upper end of the frame wall 39 andcarries an angularly directed arm 43 having a link connection 20 withthe lower end plate 7 of the expansible tube. The flapvalve 41 is openedand closed relative to the seat on the frame wall 39 due to temperaturechanges in the room and expansion and contraction of the volatile fluidF, the spring 11 compressing the expansible tube 5 when the voletilefluid ,eontrncts to raise the errn 493 end flat velve ll. When thetemperature in lll Ell

' spring.

the room is increased, the voletile fluid enpnnds end causes an eensionof the tube hellows 5 for lowering the errn lh end flop velve 4:1 uponits sent 39., J

From the above detniled description of the invention, it is believedthet the construction and operation thereot will at once he tip: parent,and while there ere herein shown end described the preferredenihodinients of the present invention, it is nevertheless to heunderstood that minor changes may be side therein without departing fromthe spirit en scope of the invention as clnimed. Q

l. A thermostet of the chnrecter end tor the purposes described,comprising n casing,

n pair of spaced disks one of which-is rigid end the otherv movable, n.bellows like tube connecting the two disks, n svvivelled screw threadedthrough one endot the cnsing end ettnohed to the rigid disk n springlocated in seid casing between the movable disk and the end of thecasing, and. it link attached to the movable disk and projecting fromthe casing, said linh pnssing enielly through the 2. A thermostat forthe purpose described comprising n cnsing, a. peir otspeced and rigiddisks in said casing, e bellows-like tube connecting suid disks to forma closed chemloer, on ed usting screw threaded through one end of thecesi and having swivel oonnec-- tion with one of t e disks, a, coilspring within the casing and interposed between the re- 5 manning end ofthe casing and the second disk, and a link extending into the casingthrough said spring and having its end attached to said second disk. 2

' In testimony whereof I aflix my signature JAMES J. 'LAWLER.

